Cisco Security Advisory – The H.323 implementation in Cisco IOS Software contains two vulnerabilities that may be exploited remotely to cause a denial of service (DoS) condition on a device that is running a vulnerable version of Cisco IOS Software.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/94152/cisco-sa-20100922-h323.txt
Source: https://packetstormsecurity.com/files/94152/Cisco-Security-Advisory-20100922-h323.html